Interface 8051 with ask 433mhz

Hello,

I am using ask module of 433 Mhz.

I Have connected my ask transmitter data pin to max232 as i am sending the data through UART.

and receiver data pin to my P3.0(RXD) pin of 89c51.

But it is not working fine.

The code is correct because i checked it using wired connection that means directly connecting max232 pin no.12(tx pin) to P3.0, which is working correct.

I have used lcd to display the character sent by uart.
What to do to make it work wirelessly using uart

Thanks